Computing machine



Oct. 25, 1932. I F. A. HART COMPUTING MACHINE Filed Jan. -21. 1927 l L r I I l I I I I l l l 1 l l l I I WITNESSES 14; m

ATTORNEY Patented Oct. 25, 1932 lessee! UNITED STATES PATENT ore-ice,

. FREDERICK A. HART, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO REMINGTON TYFE- WRITER COMPANY, OF ILION', NEW YORK, A CORPORATION OF NEW YORK COMPUTING MACHINE Application filed January;' 21, .1927, Serial No. 162,478.

My invention relates to computing machines. In these machines there are parts of the mechanism that are required to move with a considerable degree of precision and at the I same time, especially in computing machines of that class in which the computing mechanism is operated by the keys of a typewriter, it is necessary that the parts move freely so as to offer as little resistance as possible to the 1 operation of the key. The present invention has for its principal object to improve mechanism of this character in respect to precision of movement and readiness, accuracy and permanency of adjustment, together with freedom of movement; and to attain these objects with mechanism that may be easily and cheaply manufactured.

To the above and other ends my. invention consists in certain features of construction and combinations and arrangements of parts, all of which will be fully described herein and particularly pointed out in the claims.

I have shown my invention applied to a Remington combined typewriting and computing machine, the general construction and mode of operation of which are well-known in the art. Forthe purposes of the present invention the machine may, if desired, be made as described in the patent to Wahl No. 1,270,471, dated June 25, 1918, except as hereinafter pointed out. In other words, for the purpose of description the invention in the form in which it is set forth herein may be regarded as an improvement in the mechanical structure of the machine described in said patent. In view of what has just been said, the accompanying drawing shows only so much of the machine as is necessary to illustrate my improvements.

In said drawing, which is more or less fragmentary,

Figure leis a front view; I Figure 2', a right-hand view in section on the line 2 2 of Figure 1;

Figure 3 is a section about on the line 3-3 of Figure 1 and looking toward the left.

Figure 4 isa perspective of one of the differential arms and associated parts disassembled.

Figures 3 and 4 are on a larger scale than Figures 1 and 2. 1

The Remington combined typewriting and computing machine comprises a Remington typewriter having attached thereto computing mechanism of the sort described inthe VJahl patent above referred to. The actuator of said computing mechanism comprises a main frame casting 10 secured to the top plate of the typewriter and a number of sheet rear planes from said casting.

Seven of said plates are shown in the drawing and designated 11,12, 13, 14, 15, 16 and 17. Plates 11 and 14 may be regarded as the metal frame plates projecting in front and tWo end plates of the vertical actuator and these are secured respectively to two forward- 'ly projecting'lugs or brackets 18 and 20-integral with main casting 10. Plate 15 is the left-hand end plate of the cross actuator, the

right-hand end plate of which is not shown,

but in the machine it is supported on the ex treme right-hand end of the casting 10. 4 The frame plates 15, 16 and 17 are supported directly or indirectly from plate 14 and the right-hand end plate, not shown, the supports consisting of certain cross rods or posts, some of which are shown and lettered 21, 22, 23 and 24. Each of the partsmarked 21, 22 and 23 consists of a rod running through all of the plates and having sleeves or bushings T strung on it to space the plates apart; The bracket or plate 11 is fastened to the main casting by two screws 25 and plate 14 by two screws 26. V 1

Each of the ten numeral keys ofv the typewriter has connected thereto a link 27, Fig. 3, which at its upper end'is pivoted to a socalled fan 28, the hub of which isjournaled on a cross rod 30 of the vertical actuator. The fan 28 has an opening 36 through plate 13 by three ball-bearing rollers 91, 92 and 93 '(Figsrl and 3). This differential rock shaft44 carries the usual peculiar hub 'structure'45 to which at, 46 is pivoted the us'ual gear sector or segment 74. which pcrates the vertical master wheel. This gear segment is arranged to act on the down stroke of the key on a drive pinion 48 foraddition of on an auxiliary pinion r50 forv subtraction,

said

and t e former splined on the shaft 51 of the vertical master Wheel 52 which drives the so-- called carrying wheels .53 of the yertical totali'zers, the last traveling back and'forth in unison withgthe typewriter carriage all of these parts being and operating the same as heretofore, o 1 H ,,Jour:naled in the frame plates and 16 is the differential-shaft 54 of the cross footer onv which the gear sector or segment 55 is mounted after the same fashion as the vertical gear sector 47. The sector 55 is adapted to mesh for addition with the drive "pinion 56,.and for subtraction with another drive Pinion not shown, thepinion 56 being splined on the shaft 57 of the cross master wheel 58,

' saidshaft journaled in the frame plates 15 and 17, all as heretofore. The two differential shafts are driveninunison by a linkage situated between the plates 14 and 15 andcomprising an arms 60 fast on the righthandcend of shaft 44, an arm 61 fast on the left-hand end of shaft 54 and "a connecting link .62. .o a.

the parts above referred to perform substantially foil-3. 4

The differential shaft 44hashereto'forehad aplain bearingin ea h ofthe f am P te 1 the samefunctions as hereto- "Qb and '14s and has beengsupported at the frame latej13 by havingmountedthereon a plain gearingvsleeve. It is necessary thatthis shaft move with considerable precision because its function is ,totnrn themaster wheels and '45 5841's ekactlywas possible a definite number of tooth-spaces, depending in a each instance won the value of the numeral key opera-ted. It is necessaryat the same time thatthis shaft turn quitefreely because it is operated rapid- -l wbythe down strokeof a typewriterkey.

havertherefore mounted this shaft on ball bearings by means described and claimed in an application which is a division" of this ,4 I v 7 h ,4 l T heshaft 44 is of some length and some of .the,,-difi'erentia1 arms 43 are mountednear the til):

middleof it, and the segment 47 isalso mount- ,ed at somev distance from the endof it. it is'these differential arms and this segment thatare required to move withprecision 'lsessen'tial that the shaft do as little springing as possible under the force of the key op- Leration. Itis for this reason that in themachine as. 'h r efo e co at 1a)bearing sleeve has been provided at the frame plate plinion's being in mesh :wi'th each otherv Y13, and I also support the shaft at that'point i but by the rollers 91, 92, 93 above mentioned.

This shaft turns throughan angle of about forty degrees, and in that angle it can be sprung a little if it was not absolutely straight inathe first instance without imposing noticeable resistance on the key stroke, provided thebearing at the middle and those at the ends are sufliciently'near frictionless. To: this end ;I"'giuide.jthe' shaftatfthejframe plate 13 by means of three ball bearing rollers 91, 92 and 93 these-rollers being situated of course at about oneyhundred and twenty degrees from each other-arouiid the shaft. accommodate this guiding system the late gas'be'encut away so as notfto tone [the sat.

g The iseased-11 'or'spaany disposed we; arms 43shown thedrawing replace arm's hereto fore a ed in exactly the same situation and arrangement. 7 Heretome, each goose neck 38 has'come down between two'arms,fe'ach having its own hub separatelymounited ontlie In order to I shaft 44 and secured thereto by a pin driven I I through the hub ma ma; A m les having triunnions at. its ends was ournaled between 1 these two adjacent arms and cooperated with the cam slot 41 the goose-'neckIIt is, o'f course, essential that these arms be disposed with accuracy because the extent towhich each key will turn the aiaerenaa shaft depends entirely on the angle at which the am projects from the shaft. These arms have heretofore been mounted on the shaftby' the aid of anexpe'n'sive which located a'llio f the arms asexaetly possible in their correct relationship to the'seg1niifi47,'the holes being drilled fand jthe s ins, driven while have shown these hubs cut away as much: as

possible as for exampl'e at 138'and'140', this being for the sakefof lightness made desirable by the number ofthese arms that are mounted on the shaft and the rapidity with which the shaft ihastobe operated by a lightstroke on the typewriter key The pair of arms desired is secured by cutting thepiece a slot in a plane perpendicular V to the shaft as shown for enample'in 4. With ,ja piece-made this it isiiot practicable tomoiint'between the two arms a" roller having'triinnions as heretofore practised. I accordinglydri'll Iii Cal

a hole 141 through the two arms and insert therein a bearing piece or wrist 42 consisting of a small tube of steel. This tube or hollow rod is inserted through the hole or holes 141 and a piece of wire 142 is passed through the a hollow rod 42 and its ends bent down making ears or tines 143 which overlap the arms 48 in such a manner as to prevent the rod 42 from coming out of the holes. This rod is made very hard and is ground to precision. It does not act as a roller but it is loose enough to creep, as it were, in the holes 141 under the action of the goose-neck 38 so that it does not always present the same part of its surface to said goose-neck. The whole construction is such that the device works smoothly and is suficiently durable. If at any time one of these bearing pieces 42 should show any appreciable wear it is the work of but a few seconds to replace it with a new one, it being I necessary only to straighten out one of the tines 143 sufliciently to allow the withdrawal of the bearing piece 42 and the wire 142 which can be replaced by new parts by merely inserting them and bending the wire.

The shaft 44 has other devices mounted on it, for example an arm 144, Fig. 1, which is used for certain locking purposes and in connection with a disconnect lever, and another arm 145 which has connected with it the returning spring 146 for the shaft and which also cooperates with a certain locking device 147. As heretofore constructed all of these parts have been mounted on the shaft in the jig by pins driven through the hubs of the arms.

With the present construction the devices are not mounted on the shaft in a jig but are adjusted in the machine itself. For example, the extreme left-hand arm 43 cooperates with the 1 numeral key. Segment 47 is set by means of a gage in the position to which this key should move it. The key itself is depressed so as to bring its goose-neck 88 into engagement with the follower 42 and the clamp screw 137 is tightened. The entire adjustment of this arm is then complete taking account as it does of all inaccuracies of manufacture, either in the shaft 44 itself, in the arm 43, or in the goose-neck 38. The whole purpose of this arm and goose-neck is to move the segment 47 one tooth space from normal and if the adjustment is made as described then all of the parts, whatever their initial inaccuracy of manufacture may be, are in the correct relationship to cause the 1 key to do exactly that. The other arms are adjusted in the same way. It .will be perceived that by employing the improved arms described, a good deal of time and expense is saved in the manufacture of the machine.

It should also be remarked that this split hub construction takes a very firm hold on the shaft and is a thoroughly reliable construction. It will be observed from the nations in the machine, aside from the arms 43. For example, the shaft 54 has an arm l48 mounted on it by this same construction,"

this arm being adapted to contact with some stationary part of the machine, in the present instance with the'rod 118, to arrest the shaft'j 54 in its normal position. It willbe perceived that once thissha'ft is set in its normal position bymeans of a gage applied to the segment 55, it is the work of but a few seconds to turn this arm 148 down against the rod 118 and to tighten its clamp screw 150.

2 Various changes may be made without departing from my invention.

I/Vhat I claim as new and desire to secure by Letters Patent, is

1. In a computing machine, the combination with a rock shaft and a cam for rocking said shaft, of an arm having a split hub and a clamping screw whereby it is secured rigidly to said shaft in adjusted position, said arm being slotted in a plane perpendicular to said shaft so as to make two branches, a hollow pin or follower piece loosely inserted in holes through said branches, and a wire passing through said hollow pin and bentat the ends thereof to prevent said pin from coming out of said holes.

2. In a computing machine, the combination with a rock shaft and a cam for rocking said shaft, of an arm having a split hub and a clamping screw whereby it is secured rigidly to said shaft in adjusted position, said arm being slotted in a plane perpendicular to said shaft so as to make two branches, a hollow pin or follower piece inserted in holes in said branches with enough looseness to enable it to creep under the action of said cam so as at different times to expose different parts of its surface to such action, and means for preventing said pin from coming out of said holes. I

3. In a computing machine, the combination with a rock shaft and a series of cams for rocking said shaft differentially, and a cam for each digit, of a series of arms mounted on said shaft, an arm for each of said cams,

each of said arms having a split hub and a clamp screw whereby it can be rigidly secured to said shaft in adjusted position, and each said arm being slotted perpendicular to said shaft and having a follower pin inserted adding machine; a cam-operated part slotted to "form two branches having holes extending through the branches, a tubular iollower loose in said, holes anda wire extending through the tube and bent at its ends to prevent the follower from coming out of the JSignedat fhe Borough of Mnhha ttsm city of New York,;in the county of New York? and Statefof New York this 20th day of J anu- 10 r'y' A D. 1927 REIjERICK A. HART. 

